Checking The Piston Pin - Yamaha 2011 FZ8NA(C) Service Manual

Piston ring side clearance
Top ring
0.030–0.065
0.0026 in)
Limit
0.115 mm (0.0045 in)
2nd ring
0.020–0.055
0.0022 in)
Limit
0.115 mm (0.0045 in)
2. Install:
• Piston ring
(into the cylinder)
TIP
Level the piston ring into the cylinder with the
piston crown.
3. Measure:
• Piston ring end gap
Out of specification → Replace the piston
ring.
TIP
The oil ring expander spacer's end gap cannot
be measured. If the oil ring rail's gap is exces-
sive, replace all three piston rings.
CONNECTING RODS AND PISTONS
mm (0.0012–
mm (0.0008–
5-72
Piston ring end gap
Top ring
0.25–0.35 mm (0.0098–0.0138
in)
Limit
0.60 mm (0.0236 in)
2nd ring
0.35–0.50 mm (0.0138–0.0197
in)
Limit
0.85 mm (0.0335 in)
Oil ring
0.10–0.35 mm (0.0039–0.0138
in)
a. 5 mm (0.20 in)
EAS24440

CHECKING THE PISTON PIN

The following procedure applies to all of the
piston pins.
1. Check:
• Piston pin
Blue discoloration/grooves → Replace
the piston pin and then check the lubrica-
tion system.
2. Measure:
• Piston pin outside diameter "a"
Out of specification → Replace the piston
pin.
Piston pin outside diameter
16.990–16.995 mm (0.6689–
0.6691 in)
Limit
16.970 mm (0.6681 in)